Vehicle-mounted charging and discharging system

Abstract

The application provides a vehicle-mounted charging and discharging system, which comprises an AC / DC conversion circuit, a first capacitor, a second capacitor, a first controllable switch circuit, a second controllable switch circuit, a first DC / DC conversion circuit and a second DC / DC conversion circuit. The AC / DC conversion circuit comprises a first node, a second node and a third node. The first capacitor is electrically connected with the first node and the second node respectively. The second capacitor is electrically connected with the first capacitor and the third node respectively. The first controllable switch circuit is electrically connected with the first node and the second controllable switch circuit respectively. The second controllable switch circuit is electrically connected with the third node. The first DC / DC conversion circuit comprises a fourth node and a fifth node. The fourth node is electrically connected with the first node. The fifth node is electrically connected with the third node. The second DC / DC conversion circuit comprises a sixth node and a seventh node. The sixth node is electrically connected with the second controllable switch circuit. The seventh node is electrically connected with the second capacitor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle-mounted power supply, in particular to a vehicle-mounted charging and discharging system for electric vehicles. BACKGROUND

[0002] With the rapid development of electric vehicles, their cruising range is increasing, and the stored electric energy is more and more, based on this feature, the demand for using electric vehicles as power supply equipment is more and more obvious, and the vehicle-mounted charging and discharging system is required to not only charge the power battery but also discharge the power battery.

[0003] At present, the high-voltage (HV) DC / DC converter and the low-voltage (LV) DC / DC converter in the vehicle-mounted charging and discharging system are essential devices of electric vehicles, and the high-voltage (HV) DC / DC converter is mostly bidirectional. In order to realize the integration of the two, the low-voltage (LV) output DC / DC converter and the high-voltage (HV) DC / DC converter often adopt a common BUS (bus) scheme in the topology architecture. This scheme has at least one of the following advantages: the input voltage of the LV DC / DC converter can be stabilized by the high-voltage bidirectional DC / DC, and the output can be modulated by PWM (Pulse Width Modulation) to achieve a wide range of voltage output. In an embodiment, the low-voltage (LV) output DC / DC converter of this scheme usually adopts a full-bridge structure and cooperates with the high-voltage (HV) DC / DC converter, and is applied to single-phase input. Under the condition of low-voltage input (such as 400V), the low-voltage (LV) DC / DC with full-bridge structure is a good choice.

[0004] However, under the condition of three-phase input, the BUS voltage is 800V, and high-voltage silicon carbide devices need to be used. At this time, if the full-bridge structure is still used, the cost will be greatly increased. SUMMARY

[0005] Therefore, a vehicle-mounted charging and discharging system with reduced cost and simplified design is provided.

[0006] A vehicle-mounted charging and discharging system is electrically connected to a single-phase / three-phase power supply, comprising:

[0007] An AC / DC conversion circuit, a first end of the AC / DC conversion circuit is electrically connected to the single-phase / three-phase power supply, and a second end of the AC / DC conversion circuit comprises a first node, a second node and a third node;

[0008] A first capacitor, a first end of the first capacitor is electrically connected to the first node, and a second end of the first capacitor is electrically connected to the second node;

[0009] a second capacitor, a first end of the second capacitor is electrically connected with a second end of the first capacitor, and a second end of the second capacitor is electrically connected with the third node;

[0010] a first controllable switch circuit, a first end of the first controllable switch circuit is electrically connected with the first node;

[0011] a second controllable switch circuit, a first end of the second controllable switch circuit is electrically connected with a second end of the first controllable switch circuit, and a second end of the second controllable switch circuit is electrically connected with the third node;

[0012] a first DC / DC conversion circuit, a first end of the first DC / DC conversion circuit comprises a fourth node and a fifth node, the fourth node is electrically connected with the first node, and the fifth node is electrically connected with the third node, and a second end of the first DC / DC conversion circuit is configured to input / output a first voltage;

[0013] a second DC / DC conversion circuit, a first end of the second DC / DC conversion circuit comprises a sixth node and a seventh node, the sixth node is electrically connected with a first end of the second controllable switch circuit, and the seventh node is electrically connected with a first end of the second capacitor, and a second end of the second DC / DC conversion circuit is configured to input / output a second voltage.

[0014] In one of the embodiments, the AC / DC conversion circuit is configured to receive AC power provided by the single-phase / three-phase power supply and convert the AC power into DC power;

[0015] the AC / DC conversion circuit is configured to provide the DC power to the first DC / DC conversion circuit, so that the first DC / DC conversion circuit outputs the first voltage based on the DC power;

[0016] the AC / DC conversion circuit is further configured to provide the DC power to the second DC / DC conversion circuit through the first capacitor, the second capacitor, the first controllable switch circuit and the second controllable switch circuit, so that the second DC / DC conversion circuit outputs the second voltage based on the DC power.

[0017] In one of the embodiments, the first DC / DC conversion circuit is configured to receive the first voltage and convert the first voltage, and provide the converted first voltage to the second DC / DC conversion circuit, so that the second DC / DC conversion circuit outputs the second voltage based on the converted first voltage.

[0018] In one of the embodiments, the first DC / DC conversion circuit converts the first voltage and provides the converted voltage to the AC / DC conversion circuit, and the AC / DC conversion circuit converts the provided voltage and outputs the converted voltage to the single-phase / three-phase power supply.

[0019] In one of the embodiments, the AC / DC conversion circuit is a bidirectional conversion circuit.

[0020] In one of the embodiments, the first controllable switch circuit comprises:

[0021] a first switch, a first end of the first switch being electrically connected to a first end of the first capacitor and the first node respectively, and a second end of the first switch being electrically connected to a first end of the second controllable switch circuit and the sixth node respectively.

[0022] In one of the embodiments, the second controllable switch circuit comprises:

[0023] a second switch, a first end of the second switch being electrically connected to a second end of the first controllable switch circuit and the sixth node respectively, and a second end of the second switch being electrically connected to a second end of the second capacitor and the third node respectively.

[0024] In one of the embodiments, the vehicle-mounted charging and discharging system further comprises:

[0025] a third capacitor, a first end of the third capacitor being electrically connected to the first end of the second controllable switch circuit and the second end of the first controllable switch circuit respectively, and a second end of the third capacitor being electrically connected to the sixth node.

[0026] In one of the embodiments, the second voltage is less than the first voltage.

[0027] In one of the embodiments, the second DC / DC conversion circuit comprises:

[0028] a transformer, a first end of a primary side of the transformer being electrically connected to the first end of the second controllable switch circuit, and a second end of the primary side of the transformer being electrically connected to the first end of the second capacitor;

[0029] a secondary side of the transformer being a full-wave rectifier circuit or a full-bridge rectifier circuit or a half-bridge rectifier circuit or a half-wave rectifier circuit.

[0030] In one of the embodiments, the first DC / DC conversion circuit comprises at least two DC / DC converters, inputs of the at least two DC / DC converters being connected in parallel or in series, and outputs of the at least two DC / DC devices being connected in parallel or in series.

[0031] Compared with the prior art, the vehicle-mounted charging and discharging system can save one bridge arm and reduce cost while ensuring original functions under three-phase input by sharing the first capacitor and the second capacitor on the bus with the second DC / DC conversion circuit and cooperating with the first controllable switch circuit, the second controllable switch circuit and the first DC / DC conversion circuit. Meanwhile, the vehicle-mounted charging and discharging system can ensure the functions under single-phase input and has the advantage of simple structure. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A principle block diagram of a vehicle-mounted charging and discharging system provided by an embodiment of the present application is shown in the figure.

[0033] Figure 2 A circuit schematic of a vehicle-mounted charging and discharging system provided by an embodiment of the present application is shown in the figure. Figure 1

[0034] Figure 3 A circuit schematic of a vehicle-mounted charging and discharging system provided by another embodiment of the present application is shown in the figure. Figure 2

[0035] Figure 4 A circuit schematic of a vehicle-mounted charging and discharging system provided by another embodiment of the present application is shown in the figure. Figure 3

[0036] 10 vehicle-mounted charging and discharging system

[0037] 101 single-phase / three-phase power supply

[0038] 100 AC / DC conversion circuit

[0039] 200 first capacitor

[0040] 300 second capacitor

[0041] 400 first controllable switch circuit

[0042] 410 first switch

[0043] 500 second controllable switch circuit

[0044] 510 second switch

[0045] 600 first DC / DC conversion circuit

[0046] 700 second DC / DC conversion circuit

[0047] 710 transformer

[0048] 800 third capacitor DETAILED DESCRIPTION

[0049] ​​​In order to make the above objectives, features and advantages of the present application more clear and easily understood, the detailed description of the specific embodiments of the present application will be described below with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways from those described herein without departing from the scope of the present application. It is therefore intended that the present application is not limited by the specific implementation described below, and it is intended that the present application covers all modifications and changes within the scope of the present application.

[0050] It is to be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description of the application, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0052] Please refer to Figure 1 An embodiment of the present application provides a vehicle-mounted charging and discharging system 10 electrically connected to a single-phase / three-phase power supply 101. The vehicle-mounted charging and discharging system 10 comprises an alternating current / direct current conversion circuit 100, a first capacitor 200, a second capacitor 300, a first controllable switch circuit 400, a second controllable switch circuit 500, a first direct current / direct current conversion circuit 600, and a second direct current / direct current conversion circuit 700. A first end of the alternating current / direct current conversion circuit 100 is electrically connected to the single-phase / three-phase power supply 101. A second end of the alternating current / direct current conversion circuit 100 comprises a first node, a second node, and a third node.

[0053] A first end of the first capacitor 200 is electrically connected to the first node. A second end of the first capacitor 200 is electrically connected to the second node. A first end of the second capacitor 300 is electrically connected to the second end of the first capacitor 200. A second end of the second capacitor 300 is electrically connected to the third node. A first end of the first controllable switch circuit 400 is electrically connected to the first node. A first end of the second controllable switch circuit 500 is electrically connected to a second end of the first controllable switch circuit 400. A second end of the second controllable switch circuit 500 is electrically connected to the third node.

[0054] The first end of the first DC / DC conversion circuit 600 includes a fourth node and a fifth node. The fourth node is electrically connected to the first node. The fifth node is electrically connected to the third node. The second end of the first DC / DC conversion circuit 600 is configured to input / output a first voltage. The first end of the second DC / DC conversion circuit 700 includes a sixth node and a seventh node. The sixth node is electrically connected to the first end of the second controllable switch circuit 500. The seventh node is electrically connected to the first end of the second capacitor 300. The second end of the second DC / DC conversion circuit 700 is configured to input / output a second voltage.

[0055] It can be understood that the specific circuit structure of the AC / DC conversion circuit 100 is not limited as long as it has the function of converting the AC power provided by the single-phase / three-phase power supply 101 into DC power. In an embodiment, the AC / DC conversion circuit 100 can be composed of a full-bridge rectifier and an EMI filter. In an embodiment, the AC / DC conversion circuit 100 is a PFC (Power Factor Correction) circuit. The AC power provided by the single-phase / three-phase power supply 101 is converted into DC power by the AC / DC conversion circuit 100 and provided to the first DC / DC conversion circuit 600.

[0056] In an embodiment, the AC / DC conversion circuit 100 is a bidirectional conversion circuit. That is, the AC / DC conversion circuit 100 can convert the AC power provided by the single-phase / three-phase power supply 101 into DC power. It can also convert the DC power provided by the first DC / DC conversion circuit 600 into AC power.

[0057] In an embodiment, the first node can be the positive electrode of the second end of the AC / DC conversion circuit 100. The third node can be the negative electrode of the second end of the AC / DC conversion circuit 100. Similarly, the fourth node can be the positive electrode of the first end of the first DC / DC conversion circuit 600, and the fifth node can be the negative electrode of the first end of the first DC / DC conversion circuit 600. The sixth node can be the positive electrode of the first end of the second DC / DC conversion circuit 700, and the seventh node can be the negative electrode of the first end of the second DC / DC conversion circuit 700.

[0058] It can be understood that the specific circuit structure of the first controllable switch circuit 400 and the second controllable switch circuit 500 is not limited, as long as it forms a half-bridge structure with the second controllable switch circuit 500. In an embodiment, the first controllable switch circuit 400 can be composed of an insulated gate bipolar transistor, a metal-oxide semiconductor field effect transistor, or a silicon carbide switch. In an embodiment, the first controllable switch circuit 400 can also be composed of other switches, such as an IGBT (Insulated Gate Bipolar Transistor) and the like.

[0059] It can be understood that the specific circuit structure of the second controllable switch circuit 500 is not limited, as long as it forms a half-bridge structure with the first controllable switch circuit 400. In an embodiment, the second controllable switch circuit 500 can be composed of an insulated gate bipolar transistor, a metal-oxide semiconductor field effect transistor, or a silicon carbide switch. In an embodiment, the second controllable switch circuit 500 can also be composed of other switches, such as an IGBT (Insulated Gate Bipolar Transistor) and the like.

[0060] It can be understood that the specific structure of the first DC / DC conversion circuit 600 is not limited, as long as it has the function of outputting the first voltage based on the DC output provided by the AC / DC conversion circuit 100, or outputting the DC to the AC / DC conversion circuit 100 based on the first voltage. In an embodiment, the first DC / DC conversion circuit 600 can be composed of a DC / DC converter and an EMI filter. In an embodiment, the first DC / DC conversion circuit 600 can also be composed of at least two DC / DC converters. The inputs of the at least two DC / DC converters are in series (as shown in Figure 2 ) or in parallel (as shown in Figure 3 ). The outputs of the at least two DC / DC devices are in parallel (as shown in Figure 2 or Figure 3 ) or in series.

[0061] In an embodiment, the first DC / DC conversion circuit 600 outputs the first voltage based on the DC provided by the AC / DC conversion circuit 100 after conversion, or the first DC / DC conversion circuit 600 outputs the DC to the AC / DC conversion circuit 100 based on the first voltage after conversion. That is, the first DC / DC conversion circuit 600 is a bidirectional conversion circuit.

[0062] It can be understood that the specific structure of the second DC / DC conversion circuit 700 is not limited, as long as it has the function of outputting the second voltage based on the DC power provided by the AC / DC conversion circuit 100, or outputting the DC power to the AC / DC conversion circuit 100 based on the second voltage. In an embodiment, the second DC / DC conversion circuit 700 can be composed of a DC / DC converter. In an embodiment, the second DC / DC conversion circuit 700 can also be composed of a transformer and a half-wave rectifier bridge.

[0063] In an embodiment, the second DC / DC conversion circuit 700 outputs the second voltage based on the DC power provided by the AC / DC conversion circuit 100, or the second DC / DC conversion circuit 700 outputs the DC power to the first DC / DC conversion circuit 600 based on the second voltage. That is, the second DC / DC conversion circuit 700 is a bidirectional conversion circuit. In an embodiment, the second voltage is less than the first voltage. In an embodiment, the second voltage input / output by the second end of the second DC / DC conversion circuit 700 can be low voltage (such as 9-16V). The first voltage input / output by the second end of the first DC / DC conversion circuit 600 can be high voltage.

[0064] In an embodiment, the vehicle-mounted charging and discharging system 10 can be applied to a new energy electric vehicle. Specifically, when charging the new energy electric vehicle through the single-phase / three-phase power supply 101, the AC / DC conversion circuit 100 converts the AC power provided by the single-phase / three-phase power supply 101 into DC power and provides it to the first DC / DC conversion circuit 600. The first DC / DC conversion circuit 600 outputs the first voltage based on the DC power and charges the high-voltage battery of the new energy electric vehicle.

[0065] At the same time, the AC / DC conversion circuit 100 can also provide the DC power to the second DC / DC conversion circuit 700 through the first capacitor 200, the second capacitor 300, the first controllable switching circuit 400, and the second controllable switching circuit 500. The second DC / DC conversion circuit 700 outputs the second voltage based on the DC power and charges the low-voltage battery. At this time, the AC / DC conversion circuit 100 and the second DC / DC conversion circuit 700 share the first capacitor 200 and the second capacitor 300 on the bus, and cooperate with the first controllable switching circuit 400 and the second controllable switching circuit 500, so that the vehicle-mounted charging and discharging system 10 can save one bridge arm and reduce cost while ensuring the original function when three-phase input. At the same time, it can also ensure the function of the embodiment when single-phase input, and has the advantage of simple structure.

[0066] In one embodiment, when the high-voltage battery is discharging, the first DC / DC conversion circuit 600 receives the first voltage (i.e. the voltage of the high-voltage battery when discharging) and converts the first voltage to provide the first voltage to the first capacitor 200, the second capacitor 300, the first controllable switch circuit 400 and the second controllable switch circuit 500, and then to the second DC / DC conversion circuit 700, so that the second DC / DC conversion circuit 700 outputs the second voltage to charge the low-voltage battery. At the same time, the first DC / DC conversion circuit 600 converts the first voltage to provide the first voltage to the first capacitor 200 and the second capacitor 300, and then to the AC / DC conversion circuit 100, so that the AC / DC conversion circuit 100 supplies power to the single-phase / three-phase power supply 101 based on the converted first voltage.

[0067] In one embodiment, when the low-voltage battery is discharging, the second DC / DC conversion circuit 700 receives the second voltage (i.e. the voltage of the low-voltage battery when discharging) and converts the second voltage to provide the second voltage to the first capacitor 200, the second capacitor 300, the first controllable switch circuit 400 and the second controllable switch circuit 500, and then to the first DC / DC conversion circuit 600, so that the first DC / DC conversion circuit 600 outputs the first voltage based on the converted second voltage to charge the high-voltage battery.

[0068] In this embodiment, by sharing the first capacitor 200 and the second capacitor 300 on the bus with the AC / DC conversion circuit 100 and the second DC / DC conversion circuit 700, and cooperating with the first controllable switch circuit 400, the second controllable switch circuit 500 and the first DC / DC conversion circuit 600, the vehicle-mounted charging and discharging system can save one bridge arm and reduce costs while ensuring the original functions when three-phase input is used. At the same time, it can also ensure the functions required when single-phase input is used, and has the advantage of simple structure.

[0069] Please refer to Figure 4 In one embodiment, the first controllable switch circuit 400 includes a first switch 410. The first end of the first switch 410 is electrically connected to the first end of the first capacitor 200 and the first node respectively. The second end of the first switch 410 is electrically connected to the first end of the second controllable switch circuit 500 and the sixth node respectively. In one embodiment, the first switch 410 can be an IGBT tube or a MOS tube, etc. The first controllable switch circuit 400 uses the first switch 410 to reduce costs while ensuring the original functions.

[0070] In one embodiment, the second controllable switch circuit 500 comprises a second switch 510. The first end of the second switch 510 is electrically connected with the second end of the first controllable switch circuit 400 and the sixth node respectively. The second end of the second switch 510 is electrically connected with the second end of the second capacitor 300 and the third node respectively. In one embodiment, the second switch 510 can be an IGBT tube or a MOS tube, etc. The second controllable switch circuit 500 adopts the second switch 510 to reduce the cost on the basis of ensuring the original function.

[0071] The first switch 410 and the second switch 510 form a half-bridge structure, and cooperate with the first capacitor 200 and the second capacitor 300 on the bus to make the alternating current / direct current conversion circuit 100 and the second direct current / direct current conversion circuit 700 share the first capacitor 200 and the second capacitor 300 on the bus. The vehicle-mounted charging and discharging system 10 can save one bridge arm under the premise of ensuring the original function when three-phase input is realized, thereby reducing the cost.

[0072] In one embodiment, the second direct current / direct current conversion circuit 700 comprises a transformer 710. The primary side first end of the transformer 710 is electrically connected with the first end of the second controllable switch circuit 500. The primary side second end of the transformer 710 is electrically connected with the first end of the second capacitor 300. The secondary side of the transformer 710 is a full-wave rectifier circuit or a full-bridge rectifier circuit or a half-bridge rectifier circuit or a half-wave rectifier circuit. The full-wave rectifier circuit or the full-bridge rectifier circuit or the half-bridge rectifier circuit or the half-wave rectifier circuit can adopt a traditional circuit architecture.

[0073] In one embodiment, the vehicle-mounted charging and discharging system 10 further comprises a third capacitor 800. The first end of the third capacitor 800 is electrically connected with the first end of the second controllable switch circuit 500 and the second end of the first controllable switch circuit 400 respectively. The second end of the third capacitor 800 is electrically connected with the sixth node. By arranging the third capacitor 800, the magnetic bias of the transformer 710 in the working of the second direct current / direct current conversion circuit 700 can be prevented, and the stability of the circuit is increased.

[0074] In summary, the application shares the first capacitor 200 and the second capacitor 300 on the bus with the second DC / DC conversion circuit 700, and cooperates with the first controllable switch circuit 400, the second controllable switch circuit 500 and the first DC / DC conversion circuit 600, so that the vehicle-mounted charging and discharging system can save a bridge arm and reduce the cost under the premise of ensuring the original function when three-phase input is used. Meanwhile, the application can also ensure the function when single-phase input is used, and has the advantage of simple structure.

[0075] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as falling within the scope of the present disclosure.

[0076] The above-described embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that, for those skilled in the art, some modifications and improvements can be made without departing from the concept of the application, and these all belong to the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A vehicle-mounted charging and discharging system, electrically connected to a single-phase / three-phase power supply (101), characterized in that, include: An AC / DC converter circuit (100) is provided, wherein the first end of the AC / DC converter circuit (100) is electrically connected to the single-phase / three-phase power supply (101), and the second end of the AC / DC converter circuit (100) includes a first node, a second node, and a third node. A first capacitor (200) has its first end electrically connected to the first node and its second end electrically connected to the second node. The second capacitor (300) has its first end electrically connected to the second end of the first capacitor (200), and its second end electrically connected to the third node. A first controllable switch circuit (400) is provided, wherein a first terminal of the first controllable switch circuit (400) is electrically connected to the first node. The second controllable switch circuit (500) has its first terminal electrically connected to the second terminal of the first controllable switch circuit (400), and its second terminal electrically connected to the third node. A first DC / DC converter circuit (600) has a first terminal including a fourth node and a fifth node, the fourth node being electrically connected to the first node and the fifth node being electrically connected to the third node, and the second terminal of the first DC / DC converter circuit (600) being used for inputting / outputting a first voltage; The second DC / DC converter circuit (700) has a first terminal including a sixth node and a seventh node. The sixth node is electrically connected to the first terminal of the second controllable switch circuit (500), and the seventh node is electrically connected to the first terminal of the second capacitor (300). The second terminal of the second DC / DC converter circuit (700) is used to input / output a second voltage.

2. The vehicle-mounted charging and discharging system as described in claim 1, characterized in that, The AC / DC converter circuit (100) is used to receive AC power provided by the single-phase / three-phase power supply (101) and convert it into DC power; The AC / DC converter circuit (100) is used to supply the DC power to the first DC / DC converter circuit (600) so that the first DC / DC converter circuit (600) outputs the first voltage based on the DC power; The AC / DC converter circuit (100) is also used to supply the DC power to the second DC / DC converter circuit (700) through the first capacitor (200), the second capacitor (300), the first controllable switch circuit (400), and the second controllable switch circuit (500), so that the second DC / DC converter circuit (700) outputs the second voltage based on the DC power.

3. The vehicle-mounted charging and discharging system as described in claim 1, characterized in that, The first DC / DC converter circuit (600) is used to receive the first voltage and convert the first voltage to provide it to the second DC / DC converter circuit (700), so that the second DC / DC converter circuit (700) outputs the second voltage based on the converted first voltage.

4. The on-board charging and discharging system as described in claim 3, characterized in that, The first DC / DC converter (600) converts the first voltage and provides it to the AC / DC converter (100) so that it can be converted by the AC / DC converter (100) and output to the single-phase / three-phase power supply (101).

5. The on-board charging and discharging system as described in claim 1, characterized in that, The AC / DC converter circuit (100) is a bidirectional converter circuit.

6. The vehicle-mounted charging and discharging system as described in claim 1, characterized in that, The first controllable switching circuit (400) includes: The first switch (410) has its first end electrically connected to the first end of the first capacitor (200) and the first node, respectively, and its second end is electrically connected to the first end of the second controllable switch circuit (500) and the sixth node, respectively.

7. The vehicle-mounted charging and discharging system as described in claim 1, characterized in that, The second controllable switching circuit (500) includes: The second switch (510) has its first end electrically connected to the second end of the first controllable switch circuit (400) and the sixth node, respectively, and its second end electrically connected to the second end of the second capacitor (300) and the third node, respectively.

8. The vehicle-mounted charging and discharging system as described in claim 1, characterized in that, Also includes: The third capacitor (800) has its first end electrically connected to the first end of the second controllable switch circuit (500) and the second end of the first controllable switch circuit (400), respectively, and its second end is electrically connected to the sixth node.

9. The on-board charging and discharging system according to any one of claims 1-8, characterized in that, The second voltage is less than the first voltage.

10. The vehicle-mounted charging and discharging system as described in claim 1, characterized in that, The second DC / DC converter circuit (700) includes: A transformer (710) has its primary side first end electrically connected to the first end of the second controllable switch circuit (500), and its primary side second end electrically connected to the first end of the second capacitor (300). The secondary side of the transformer (710) is a full-wave rectifier circuit, a full-bridge rectifier circuit, a half-bridge rectifier circuit, or a half-wave rectifier circuit.

11. The vehicle-mounted charging and discharging system as described in claim 1, characterized in that, The first DC / DC converter circuit (600) includes at least two DC / DC converters, the inputs of the at least two DC / DC converters are connected in parallel or in series, and the outputs of the at least two DC / DC devices are connected in parallel or in series.

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